The classification of refrigerants and selection requirements

a, the classification of refrigerants

refrigerant according to the size of the condensing pressure under normal temperature and evaporating temperature under atmospheric pressure, can be divided into three categories:

1, the high temperature low pressure refrigerant

evaporation temperature above 0 ℃, condensing pressure lower than that of 29. 41995×104Pa。

2, medium pressure medium temperature refrigerant

- evaporation temperature 50 ~ 0 ℃, condensing pressure ( 196. 113-29. 41995). ×104Pa。

3, high low temperature refrigerant

evaporation temperature is below - 50 ℃, the condensing pressure is higher than 196. 133×104Pa。

2, refrigerant selection requirements

1, the working temperature and working pressure refrigerant wants moderate

under the atmospheric pressure, the refrigerant evaporation temperature is low enough, in order to satisfy the temperature of the cooling requirements;

at room temperature, the refrigerant should have lower condensing pressure, due to the condensing pressure too high sealing performance of the refrigeration system agent structure strength requirement is high. General requirements of the refrigerant condensing pressure is: 12 x 105 ~ 15 x 105 Pa;

at room temperature, the refrigerant should have relatively high evaporation pressure, because if the pressure inside the evaporator under atmospheric pressure, the outside air through a gap in the refrigeration system easily, make the pressure in the system, reduce the refrigerating capacity, increase power consumption. At the same time the moisture in the air can cause cooling system to produce ice wall and other consequences.

2, refrigerant will have a larger unit volume refrigerating capacity

the same specifications of the refrigeration equipment, elected by the refrigerant units volumetric refrigerating capacity is big, can obtain larger refrigerating capacity.

under the same conditions, when the capacity must be unit volume of refrigerant refrigerating capacity is big, can reduce the refrigerant volume of the system, and also can be corresponding to shrink the size of the compressor.

3, refrigerant critical temperature is higher, low freezing point to

critical temperature is high, easy to refrigerant said in ambient temperature condensate liquid. Low freezing point, low temperature, can be produced to expand the use of refrigerant temperature range, reducing the loss of throttling, refrigeration coefficient of progress.

4, refrigerant, viscosity and density as far as possible little

viscosity and density is small, can make the system in the refrigerant cycle, small flow resistance, reduce the cycle of energy consumption, appropriate to reduce the pipe size, and allow line have smaller bending radius ( And this is very important to reduce the evaporator pressure loss) , but also can reduce the chiller to the impact of the compressor valve group, prolong the service life of the compressor.

5, the coefficient of thermal conductivity of refrigerant and heat release coefficient is higher than

coefficient of thermal conductivity and heat release coefficient is high, can reduce the structure of the heat exchanger in refrigeration system appropriately, and progress in the thermal efficiency of heat exchanger.

6, and other aspects of refrigerant requirements

not burning, not explode, non-toxic, non-corrosive, affordable, easy to buy.

this release of the refrigerant, freon manufacturers, for details, please click on the query.